Remove password Formio component

[sergei-maertens]

Part of #3283

This component never made sense, it was only added reluctantly because the original programme of requirements specified it.

Passwords being stored in plain text are a terrible, terrible idea. Nobody should have every actually used this in a real form.

Checklist

Check off the items that are completed or not relevant.

• Impact on features

  • [x] Checked copying a form
  • [x] Checked import/export of a form
  • [x] Config checks in the configuration overview admin page
  • [x] Problem detection in the admin email digest is handled

• Release management

  • [x] I have labelled the PR as "needs-backport" accordingly

• I have updated the translations assets (you do NOT need to provide translations)

  • [x] Ran ./bin/makemessages_js.sh
  • [x] Ran ./bin/compilemessages_js.sh

• Commit hygiene

  • [x] Commit messages refer to the relevant Github issue
  • [x] Commit messages explain the "why" of change, not the how

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 96.58%. Comparing base (e4fb7bb) to head (1e1cb1a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4842 +/- ## ========================================== - Coverage 96.58% 96.58% -0.01% ========================================== Files 749 749 Lines 25531 25519 -12 Branches 3376 3375 -1 ========================================== - Hits 24659 24647 -12 Misses 608 608 Partials 264 264 ```

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